1c Post Office, Specimen Ovpt., Inverted Ovpt. (O47Sb). Without gum as issued, three extra wide margins with natural straight edge at right, Very Fine example of the only invert error among the Officials Special Printings, although the 1c Post Office stamps were printed from a 200-subject plate, the sheets were divided into panes of 100 before overprinting, therefore, only 100 of the inverted "Specimen" overprints could have been produced, and we do not know how many were sold, only a small fraction of the number printed has been located, with 2022 P.F. certificate

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